When comparing Radxa Rock2 vs The Parallella Board, the Slant community recommends The Parallella Board for most people. In the question“What are the best single-board computers?”The Parallella Board is ranked 12th while Radxa Rock2 is ranked 22nd. The most important reason people chose The Parallella Board is:

The Parallella Board makes use of the Epiphany III coprocessor which is invisible to the OS unless directly addressed through its APIs. It currently boasts 32 gigaflops from its 16-core variant with a promise of 100 gigaflops for a 64-core model which will be available in the future.

Pros

Pro

Can dual boot Linux and Android

Other than supporting several Linux distros along with Android, you can also choose to dual-boot both.

Pro

Built-in Bluetooth

Has a built-in Bluetooth module. Meaning there's no need to buy one.

Pro

Provided with a clear plastic case

Comes with a clear plastic case included in the price, which is pretty useful for most projects people would use a SBC for..

Pro

Built-in Wifi wth antenna

Has built-in Wifi capabilities.

Pro

Amazing performance because of the Epiphany coprocessor

The Parallella Board makes use of the Epiphany III coprocessor which is invisible to the OS unless directly addressed through its APIs. It currently boasts 32 gigaflops from its 16-core variant with a promise of 100 gigaflops for a 64-core model which will be available in the future.

Pro

Great board for programmers to experiment on different platforms

The Parallella is a great board for programmers to experiment programmin on ARM, FPGA and the Epiphany architecture in one compact package.

Pro

Completely open source

Parallella uses open source hardware. The drivers are released as open source as well. All the details about the board designs and schematics can be found on GitHub.

Pro

Ships with open source development tools geared towards Epiphany development

Parallella ships with several open source tools geared towards developing for the Epiphany architecture. Some of these tools include a C compiler, Eclipse, OpenCL SDK/compiler and runtime libraries.

Cons

Con

HDMI has some problems on Linux

The HDMI port has some issues on Linux, fortunately these issues are not present when using Android.

Con

Not great for media streaming

The Parallella board was built to give everyone access to a mini-supercomputer. It's strength lies in the Epiphany which makes it great for parallel computing and image processing, unfortunately it's not good with media (audio and video) streaming.

Con

Requires dedicated software development

Since it uses a different architecture than most boards, out-of-the-box software is not compatible with it. Instead, there's a huge GitHub repository with official ports of popular software compatible with the Parallella Board.